- Chord * get_note_element (Note_req * ,Duration *);
- Chord* get_rest_element (String, Duration *);
- Chord* get_word_element (String, Duration*);
+ Simultaneous_music * get_note_element (Note_req * ,Duration *);
+ Simultaneous_music* get_rest_element (String, Duration *);
+ Simultaneous_music* get_word_element (String, Duration*);